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Table 1 Difference in maternal characteristics in the included and excluded groups

From: Antenatal depression and anxiety and early pregnancy BMI among White British and South Asian women: retrospective analysis of data from the Born in Bradford cohort

Maternal characteristics Included n = 7824 Excluded n = 1596 Differences in mean or % p-valuep
Age (mean, SD) 27.3 ± 0.1 27.3 ± 0.14 0 0.96
Education level (n, %)
 None 1685 (21.5) 424 (26.6) + 5.1 < 0.0001**
 GCSE 2475 (31.6) 535 (33.5) + 1.9  
 A-level 1235 (15.8) 142 (8.9) −6.9  
 Higher than A-level 1924 (24.6) 337 (21.1) −3.5  
Missing 505 (6.4) 158 (9.9) + 3.5  
IMD Level (n, %)
 Low deprivation 2696 (34.5) 500 (31.3) −3.2 0.16
 High deprivation 5125 (65.5) 1096 (68.7) + 3.2  
Missing 3 (0.04) 0 (0.0) −0.04  
Smoking status (n, %)
 Yes 1375 (17.6) 162 (10.2) −7.4 < 0.0001**
 No 6446 (82.4) 1427 (89.4) + 7.0  
Missing 3 (0.04) 7 (0.4) + 0.36  
  1. **Significant at 0.05 significance level (two-tailed)
  2. pT-tests used for continuous variable and chi-squared with Fishers exact (where cell count < 5) used for categorical variables